S.M.A.R.T. attribute list (ATA)

This is the list of all known attributes supported by IDE and Serial ATA hard disks. Note: some manufacturers may use the attributes for different purposes also. Attributes not listed here are “vendor specific” attributes (their purpose is not known).

1 Raw Read Error Rate Errors occured while reading raw data from a disk
Indicate problem with the disk surface or the read/write heads.
Critical attribute 2 Throughput Performance General throughput performance of the hard disk
Indicate problem with motor, servo or bearings. 3 Spin Up Time Time needed by spindle to spin-up to full RPM
Indicate problem with motor or bearings.
Critical attribute 4 Start/Stop Count Count of start/stop cycles of spindle
This value does not directly affect the condition of the drive. 5 Reallocated Sector Count
(Reallocated Sectors Count)
Count of sectors moved to the spare area
Indicate problem with the disk surface or the read/write heads.
Critical attribute 6 Read Channel Margin Margin of a channel while reading data
The exact function of this attribute is not specified. 7 Seek Error Rate Rate of positioning errors of the read/write heads
Indicate problem with servo, head. High temperature can also cause this problem.
Critical attribute 8 Seek Time Performance Average time of seek operations of the heads
Indicate problem with servo.
Critical attribute 9 Power-On Time Count Total time the drive is powered on
The unit of the measure depends on the manufacturer. 10 Spin Retry Count Retry count of spin start attempts
Indicate problem with motor, bearings or power supply.
Critical attribute 11 Drive Calibration Retry Count Number of attempts to calibrate a drive
Indicate problem with motor, bearings or power supply. 12 Drive Power Cycle Count Number of complete power on/off cycles
This value does not directly affect the condition of the drive. 13 Soft Read Error Rate Number of software read errors
The number of uncorreactable read errors. 184 End-to-End error Number of parity errors during transfer between the cache RAM and the host. 187 Reported Uncorrectable Errors Errors that could not be recovered using hardware error correction methods. 188 Command Timeout Number of aborted operations due to HDD timeout. Value larger than zero may indicate power supply or data cable connection problems. 189 High Fly Writes Number of unsafe write operations outside the normal head flying range. 190 Airflow Temperature Airflow temperature
The temperature of the air inside the hard disk housing. 191 Mechanical Shock Count of problems caused by mechanical shock
Acceleration (for example falling) can cause mechanical shock. 192 Power off Retract Cycle Count of power off cycles
This value does not directly affect the condition of the drive. 193 Load/Unload Cycle Count Count of load/unload cycles
Number of cycles the head moved into landing zone position. 194 HDD Temperature Disk temperature
The temperature inside the hard disk housing. 195 Hardware ECC Recovered Count of correctable errors
Number of errors corrected by the internal error correcting mechanism. 196 Reallocation Event Count Count of sector remap operations
Number of all (successful and failed) remap operations.
Critical attribute 197 Current Pending Sector Count Count of unstable sectors
These pending sectors may be remapped to the spare area.
Critical attribute 198 Off-Line Uncorrectable Sector Count Count of uncorrectable errors when reading/writing
Indicate problem with the disk surface or the read/write heads.
Critical attribute 199 Ultra ATA CRC Error Count Count of errors during data transfer between disk and host
Indicate problem with the power supply or data cable. 200 Write Error Rate Errors occured while writing raw data from a disk
Indicate problem with the disk surface or the read/write heads. 201 Soft Read Error Rate Number of software read errors
The number of uncorreactable read errors. 202 Data Address Mark Errors Number of data address mark errors
Number of incorrect or invalid address marks. 203 Run Out Cancel Number of data correction errors
Invalid error correction checksum found during error correction. 204 Soft ECC Correction Number of corrected data errors
Errors corrected by the internal error correction mechanism. 205 Thermal Asperity Rate Number of thermal problems
Total number of problems caused by high temperature. 206 Flying Height Head flying height
The height of the disk heads above the disk surface. 207 Spin High Current Current value during spin up
The current needed to spin up the drive. 208 Spin Buzz Number of cycles needed to spin up
The number of retries during spin up because of low current available. 209 Offline Seek Performance Drive performance during offline operations
The seek performance of the drive during internal self tests. 211 Vibration During Write Vibration encountered during write operations. 212 Shock During Write Shock encountered during write operations. 220 Disk Shift Distance of the disk has shifted relative to the spindle
Incorrect disk spin can be cause by mechanical shock or high temperature. 221 G-Sense Error Rate Number of mechanical errors
Number of errors resulting from shock or vibration. 222 Loaded Hours Number of powered on hours
This value is constantly increasing (once per every hour). 223 Load/Unload Retry Count Number of load/unload operations
The number of drive head enters/leaves the data zone. 224 Load Friction Mechanical friction rate
The rate of friction between mechanical parts. Indicate problem with the mechanical subsystem of the drive. 226 Load-in Time Total time the heads are loaded
The time while the read/write heads are in the data zone. 227 Torque Amplification Count Rate of torque increase
Torque increase during the spin up operation of the hard disk. 228 Power-off Retract Count Number of power off cycles
The number of times the head was retracted as a result of power loss. 230 GMR Head Amplitude Head positioning amplitude
Head moving distances between operations. 231 Hard Disk Temperature Disk temperature
The temperature inside the hard disk housing. 240 Head Flying Hours Number of head positioning hours
Time spent during the positioning of the drive heads. 250 Read Error Retry Rate Number of retries during read operations
Number of errors found during reading a sector from disk surface. 254 Free Fall Event Count Number of free fall events detected by the accelerometer sensor.

S.M.A.R.T. attribute list (SCSI)

This is the list of all known attributes supported by SCSI hard disks. Note: some manufacturers may use the attributes for different purposes also. Attributes not listed here are “vendor specific” attributes (their purpose is not known).

01 Buffer over/under run counters 02_0000 Write errors corrected without substantial delay 02_0001 Write errors corrected with possible delays 02_0002 Total write errors 02_0003 Total write errors corrected 02_0004 Total write errors corrected by algorythm 02_0005 Total bytes written 02_0006 Total uncorrected write errors 03_0000 Read errors corrected by ECC hardware method 03_0001 Read errors corrected with possible delays 03_0002 Total read errors 03_0003 Total read errors corrected 03_0004 Total read errors corrected by algorythm 03_0005 Total bytes read 03_0006 Total uncorrected read errors 04_0000 Read reverse errors corrected by ECC hardware method 04_0001 Read reverse errors corrected with possible delays 04_0002 Total read reverse errors 04_0003 Total read reverse errors corrected 04_0004 Total read reverse errors corrected by algorythm 04_0005 Total bytes read reverse 04_0006 Total uncorrected read reverse errors 05_0000 Verify errors corrected without substantial delay 05_0001 Verify errors corrected with possible delays 05_0002 Total verify errors 05_0003 Total verify errors corrected 05_0004 Total verify errors corrected by algorythm 05_0005 Total bytes verified 05_0006 Total uncorrected verify errors 06_0000 Non medium errors 07 Last error event 0B Last deferred error or asynchronous event 0D_0000 Temperature 0D_0001 Reference temperature 0E_0001 Manufacture date (year/week) 0E_0002 Accounting date 0E_0003 Specified cycle count over device lifetime 0E_0004 Accumulated start-stop cycles 0F Application client parameter data 10 Self test results log 18 Protocol specific port log 37_0000 Blocks sent to initiator 37_0001 Blocks received from initiator 37_0002 Blocks read from cache and sent to initiator 37_0003 I/O commands with size smaller than segment size 37_0004 I/O commands with size larger than segment size 3E_0000 Power on time 3E_0008 Remaining minutes until next internal test

S.M.A.R.T. attributes